AES encryption is always active on an 840 or 840 Pro Series SSD. In order to benefit from the encryption feature, however, the user must enable an ATA password to limit access to the data. Failure to do so will render AES-encryption ineffective – akin to having a safe but leaving the door wide open. To set an ATA password, simply access the BIOS, navigate to the “Security” menu, enable “Password on boot” and set an “HDD Password.” Administrators also have the option of setting a “Master Password,” which can allow a lost user password (“HDD Password) to be recovered. The “Master Password” may also be used to unlock and/or erase the drive (depending on the settings), effectively destroying, and thus protecting, the data but allowing the drive to be reused. The setup procedure may differ slightly depending on the BIOS version installed on a particular machine. It is best to consult the user manual if there is any confusion.